(6又1/2)*(+4)+(4.28)*4又1/2-(-4.5)*(5.72)

问题描述:

(6又1/2)*(+4)+(4.28)*4又1/2-(-4.5)*(5.72)

6½×4+4.28×4½-(-4.5)×5.72
原式=26+19.26-(-25.74)
=45.26+25.74
=71